        <?php
        return [
             'back_end_page' => 5,
            'booklist_pc_page' => 24,
            'booklist_mobile_page' => 12,
            'search_result_pc' => 20,
            'search_result_mobile' => 20,
            'update_pc_page' => 22,
            'update_mobile_page' => 11,
            'img_per_page' => 0
        ];